Boiler.



A. M. BAi: vg).

BOILER. 7 APPLICATION FILED AUG.18, 191a.

1 wT n. 7 2% it CT. m mm H w a Q A. M. BAIRD.

, BOILER. APPLICATION FILED AUGJB, 1913.

" Patented 0011.27, 1914.

3 -SHEETSSHEET 3.

, prairie srs'rns PATENT @FFTGE.

enonrn M. BAIRD, vor rornxa, Kansas, nssronon. OEO'NE-HALF TO HENRY w.

' moons, or TQPEKA, KANSAS.

BOILER.

Specification of Letters Patent.

Patented @ct. at, 1191141.

Application filed August 18, 1913. 'Serial No. 785,241.

.of Kansas, have invented certain new and useful Improvements inBoilers, of which the following is a description, reference be ing hadto the accompanyingdrawings,

which form apart of my specification.

My invention relatesto the fire-box of a boiler, pertaining moreespecially to the door-sheet and flue-sheet of a fire-box of thelocomotive type.

The object of my invention is to provide a fire-box having a door-sheetand flue-sheet so constructed and arranged that the desired vflexibilitywill be obtained to com ensate for expansion and contraction whic occurin the fire-box, and thus relieve the fines and other parts of theboiler of undue strains and stresses, thereby avoiding cracking andleaking in the various parts of the fire-box encountered with fire-boxesas here tofore constructed.

My invention possesses other advantages inherent in the construction,which will be apparent from the following detailed description of theaccompanying drawings, wherein Figure 1 is a perspective view of myimproved door-sheet. view of my improved flue-sheet. Fig. 3is aperspective view of a modified form of doorsheet constructed inaccordance with my invention. Fig. 4C is a perspectiveview of a modifiedform of flue-sheet embodying my invention. Fig. 5 is a longitudinalsectional view of a sectional type of locomotive firehave shown the sameappliedito what is known as the Jacobs-Shupert type of sectionalfire-box, to which my invention is more especially adapted, as clearlyillustrated Fig. 2 is a perspective in Fig. 5, wherein the fire-box iscomposed of a suflicient number of channel sections 8, substantiallyU-shape in cross-section; the various sections 8 being secured togetherwith intervening stay-sheets 9. The fire-box end of the boiler in Fig. 5is also shown pro vided with an outer sectional shell composed ofmembers 10, which are formed with the flanges extending outward from theconvexed side of the sections; the concaved side of these outer sections10 being presented inwardly toward the fire-box; and

these sections 10 are 'secured together with the stay -sheets 9,intervening, thus supporting the fire-box in place. The lower ends ofthe'fire-box sections 8, as well as the outer sections 10, aresecurelyriveted to the mud-ring 11, as clearly shown in Fig. 5. It is evidentthat this construction of fire-box permits of considerable expansion andcontraction because of the fact that the amount of metal in therespective sections, in a transverse direction is greater than theactual distance betweenthe flanges ofeach section when in normalcondition. Dificulties, however, have been encountered in theconstruction of the door and flue sheets, which, heretofore, were madeof flat sheet metal, secured not only to the adjacent fire-box sections,but also to the outer sections of the boiler, in a similar manner to thestaysheets. Such constructions of door-sheet and flue-sheet do notprovide the necessary flexibility, but subject the lines and other partsof the fire-box and boiler to undue strains. I

To overcome the difliculties heretofore encountered, I provide a disheddoor-sheet and a flue-sheet 12 and 13, respectively, as more clearlyshown in Figs. 1 and 2. The sheets are dished so as to produce theangularly extending portions 12 and 13, respectively, the free edgeswhereof are off-set or bent substantially at right angles to theportions 12 and 13 so as to provide the flanges 12 and 13 respectively.The door-sheet 12 is, of course, also provided with the flanged opening14, the flanges 1'5 telescoping with the flange 16 of the outer shellsection 17, the flanges 15 and 16 being riveted together in the usualmanner. The flanges 12 and 13 of the door-sheet 12 and flue-sheet 13,extend substantially entirely about the three sides of the sheets; theflanges, however, being cut away at the lower corners of the sheets, asshown at 12 and 13, respectively, see Figs. 1 and 2, where thedoor-sheet and fluesheet are secured to the mud-ring. The flue-sheet 13is also provided with the requisite number and size of flue holes 18into whichthe ends of the flues 19 are welded,

rolled or expanded.

In Figs. 3 and 4,1 show modified forms of door-sheet and flue-sheet,adapting my 8 as clearly shown in Fig. 6. The lower corners 20 of theportion 20 are not flanged or bent so as to permit the lower ends to besecured to the mud-ring 11 as very clearly shown in Fig. 6. Thedoor-sheet 20, like door-sheet 12, is also provided with the opening14:, surrounded by the flange 15 which is preferably formed integralwith the sheet, see Fig. 3. Theflue-sheet 21, illustrated inFig. 4,isslightly bent rearwardly as clearly shown at 22, in order toaccommodate it to the modified form of fire-box illustrated in Fig. 6.The flanges of the re speetive sheets are shown provided withperforations in order to permit the sheets being riveted to the flangesof the adjacent firebox sections and intervening stay-sheets. As shownin the drawings, both door-sheet and flue-sheet are of a sizecorresponding with that of the adjacent fire-box sections to which theyare secured, and do not extend upward through the water space of theboiler to the outside boiler shell or sections. By dishing or concavingthe door-sheet and flue-sheet, so as toprovide a greater amount of metalthan the actual distance between the attaching edges of the adjacentfire-box sections and mud-ring, and having the door-sheet and flue-sheetindependent of the outer boiler-shell or sections, it is evident thatthey will permit the necessary expansion and contraction of the fire-boxsections and relieve the flues and other parts of the boiler of unduestrains and stresses.

In oif-setting the edges of the door-sheet and flue-sheet to produce theattaching flanges, the sheets are providedwith a series of curves,substantially Z-shape in cross-section, whereby the sheets are given thedesired flexibility necessary to meet the expension and contractionencountered in loco- .box sections contraction in this fire-box Withouttransmit forms of my impr'oveddoor-sheet and fluesheet whereby the lifeof the fir e-boxand the flues will be extended; a flexible doorsheet andflexiblaflue-shee't independent of the outer same mayghe v aried incertain respects without, however, departing from the spirit of myinvention, andI do not wish'to be understood, therefore, as limitingmyself to the exact construction shown and described.

What I claim is 1. A boiler provided with a sectional firebox, thedoor-sheet and flue-sheet whereof are secured to the adjacent sectionsof the fire-box andindependent of the outer boilershell, said sheetsbeing composed of sheet metal formed so as to provide ofl-set flangesextending substantially parallel with the main or body portions thereofwhereby the sheets are secured to the flanges -of the fireso as topermit expansion and ting the stresses to adjacent portions of theboiler and to the flues of the boiler.

2. In a boiler provided with a sectional firebox, a flue-sheet securedindependently of the outer boiler-shell, composed of sheet metal havingthree edges thereof off-set so as .to provide flanges extendingsubstantially parallel to the main or body portion thereof and to theflanges of the firerbox section to which the flanges are adapted to besecured so as to permit expansion and contraction in the fire-boxwithout transmitting the stresses to the flues of the boiler.

3. In a boiler provided with a sectional fire-box, a door-sheet securedindependently of the outer boiler-shell, formed of sheet metal withthree edges thereof oif-set so as to provide flanges extendingsubstantially parallel to the main or body portion thereof and to theflanges ofthe fire-box section to which the flanges'are adapted to besecured boiiefisections or shell; but the.

so as to permit expansion and contraction Y in the fire-box withouttransmitting the stresses to the adjacent portions of the boiler.

4. In a boiler of the class described provided with a firebox composedof channel sections having flanges extending outwardly,

the flue and door-sheets whereof are formed so as to providesubstantially right angularly extending portions about three edgesthereof, with the one or outer portion ex tending substantially parallelwith and beyond the plane of the main or body portion of the sheets andparallel with the flanges of the adjacent fire-box sections to which thesheets are secured, while the other or intermediate portion extendssubstantially at right angles to the main or body portions of the sheetsand is adapted at the lower edges thereof to overlap and be secured tothe with the intermediate part of the ofi-set pormud-ring of the boiler.tion increasing in width toward the bottom 5. In a boiler of the classdescribed, proof the sheet. vided witha sectional fire-box, a door-sheetARCHIE M. BAIRD. 5 having its top and side edges ofi-set so as toWitnesses:

provide portions extending substantially J. W. MORGAN,

parallel with the main portion of the sheet, I. S. SHEETZ.

